CN105017618A - Nanometer-zeolite-supported crosslinked-starch-modified low-density-polyethylene degradation mulch film and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of degradation film materials, and concretely relates to a nanometer-zeolite-supported crosslinked-starch-modified low-density-polyethylene degradation mulch film and a preparation method thereof. According to the master batch of the mulch film, nanometer zeolite, silica sol and the like are utilized for adsorbing and fixing crosslinked starch, the mixed powder is excellent in compatibility with polyethylene after being processed by a silane coupling agent, and thus the disadvantages that a conventional starch-polyethylene degradation film is long in degradation period and insufficient in degradation are improved, also the usage amount of crosslinked starch is increased and the production cost is reduced, added humic acid and carboxymethyl chitosan can improve soil environment and assist crop growth. The mulch film prepared according to the preparation method is good in film performances, is strong in adsorption capability, is capable of retaining water and breathing freely, is capable of accelerating organics degradation, accelerates microbe propagation, accelerates degradation, does not contain toxic or harmful substances, is safe in compositions, and is economical and environment-friendly.

Description

A kind of Low Density Polyethylene degradative plastic film by the loaded cross-linked starch conversion of nano zeolite and preparation method thereof

Technical field

The present invention relates to degradative membrane field of material technology, be specifically related to a kind of Low Density Polyethylene degradative plastic film by the loaded cross-linked starch conversion of nano zeolite and preparation method thereof.

Background technology

Mulch film, as its name suggests, be membrane covering film, in order to improve the soil moisture, keep soil moisture, maintain Soil structure, prevent the disease that pest attacks crop and certain micro-organisms cause, Promoting plant growths etc., current film-mulching technique obtains extensive popularization in agricultural, and effect of increasing production is obvious.Because now a large amount of mulch film used is nondegradable macromolecular compound, neither by microbial attack, can not disintegrate, insoluble pollution hazard will inevitably be brought to descendant if things go on like this.Therefore, study degradable mulch to come into one's own gradually.

Starch is the abundant renewable resources of nature, and it is nontoxic, fully biodegradable, but poor mechanical property and water resistance but limit it applies.Starch is carried out modification by some researchs at present, by itself and synthetic resins or degradable macromolecular material is blended makes degradation material, but these materials are subject to the restriction of its mechanical property, degradation cycle and environment for use and processing technology, the use properties of product is barely satisfactory.

Summary of the invention

The object of the invention is to, prepare a kind of Low Density Polyethylene degradative plastic film by the loaded cross-linked starch conversion of nano zeolite, the economic environment-friendly degradable mulch film that a kind of film forming properties is good, biological degradation is abundant to obtain, raw material availability is high, to achieve these goals, the technical solution used in the present invention is as follows:

A kind of Low Density Polyethylene degradative plastic film by the loaded cross-linked starch conversion of nano zeolite, it is characterized in that, this mulch film is made up of the raw material of following weight part: Low Density Polyethylene 40-50, cross-linking starch 6-8, humic acids 2-3, rhamnolipid 0.1-0.2, nano zeolite 8-12, solid content are that silicon sol 10-12, the ethylene-acrylic acid copolymer 4-5 of 20-25%, carboxymethyl chitosan 1-1.5, alkyl glycoside 0.1-0.2, silane coupling agent 0.1-0.2, sodium bicarbonate are appropriate, water 25-30.

Described a kind of preparation method by the Low Density Polyethylene degradative plastic film of the loaded cross-linked starch conversion of nano zeolite, it is characterized in that, described preparation method is:

(1) first sodium bicarbonate is dropped in water, be stirred to it to dissolve completely, be made into the basic solution that pH value is 10-12, drop into humic acids, rhamnolipid, cm-chitosan, alkyl glycoside subsequently, be stirred to mixture to dissolve completely, then cross-linking starch, silicon sol is dropped into again, and solution is heated to 60-80 DEG C, after stirring gelatinization 20-30min, nano zeolite is dropped in mixed solution, by gained slurry grinding distribution 40-50min after preliminary mixing, finally by gained material warm air drying, remove moisture completely, obtain the loaded cross-linked composites of starch of nano zeolite for subsequent use;

(2) the loaded cross-linked composites of starch of step (1) gained nano zeolite and silane coupling agent are uniformly mixed; add other leftover materials again; fully mix granulation in rear input singe screw tablets press, gained particle drops in inflation film manufacturing machine and blows film forming, to obtain final product.

Degradative plastic film prepared by the present invention take low-density polyethylene material as major ingredient, add cross-linking starch to improve its biological degradability, the power of degradation capability depends primarily on the consistency of starch and Low Density Polyethylene, in order to improve starch and poly consistency, utilize the fixing cross-linking starch of nano zeolite absorption with favourable absorption, mixed powder is excellent with polyethylene consistency after silane coupling agent process, improve traditional starch-polyethylene degradation film degradation cycle long, to degrade insufficient shortcoming, and improve the consumption of cross-linking starch, reduce production cost, the humic acids added, cm-chitosan can improve edatope, supplemental crop grows, the mulch film film properties that this invention prepares is good, high adsorption capacity, absorbent ventilate, can accelerate organic degraded, accelerates the breeding of microorganism, accelerates degraded, not containing hazardous and noxious substances, and composition safety, economic environmental protection.

Embodiment

Embodiment

The mulch film of the present embodiment is made up of the raw material of following weight part: Low Density Polyethylene 40, cross-linking starch 6, humic acids 2, rhamnolipid 0.1, nano zeolite 8, solid content are appropriate, the water 25 of silicon sol 10, ethylene-acrylic acid copolymer 4, carboxymethyl chitosan 1, alkyl glycoside 0.1, silane coupling agent 0.1, sodium bicarbonate of 20%.

The preparation method of this degradative plastic film is:

(1) first sodium bicarbonate is dropped in water, be stirred to it to dissolve completely, be made into the basic solution that pH value is 11, drop into humic acids, rhamnolipid, cm-chitosan, alkyl glycoside subsequently, be stirred to mixture to dissolve completely, then cross-linking starch, silicon sol is dropped into again, and solution is heated to 60-80 DEG C, after stirring gelatinization 205min, nano zeolite is dropped in mixed solution, by gained slurry grinding distribution 40min after preliminary mixing, finally by gained material warm air drying, remove moisture completely, obtain the loaded cross-linked composites of starch of nano zeolite for subsequent use;

(2) the loaded cross-linked composites of starch of step (1) gained nano zeolite and silane coupling agent are uniformly mixed; add other leftover materials again; fully mix granulation in rear input singe screw tablets press, gained particle drops in inflation film manufacturing machine and blows film forming, to obtain final product.

The sample that thickness is 0.01mm made by mulch film obtained by the present embodiment, follows the result that relevant criterion carries out performance test to be:

Test item	Detected result
		Tensile strength (longitudinal direction)	18.2
Tensile strength (transverse direction)	16.5
		Transmittance	82.4%
30d landfill rate of weight loss	21.4%
		120d landfill rate of weight loss	49.5%

Claims (2)

1. the Low Density Polyethylene degradative plastic film by the loaded cross-linked starch conversion of nano zeolite, it is characterized in that, this mulch film is made up of the raw material of following weight part: Low Density Polyethylene 40-50, cross-linking starch 6-8, humic acids 2-3, rhamnolipid 0.1-0.2, nano zeolite 8-12, solid content are that silicon sol 10-12, the ethylene-acrylic acid copolymer 4-5 of 20-25%, carboxymethyl chitosan 1-1.5, alkyl glycoside 0.1-0.2, silane coupling agent 0.1-0.2, sodium bicarbonate are appropriate, water 25-30.

2. a kind of preparation method by the Low Density Polyethylene degradative plastic film of the loaded cross-linked starch conversion of nano zeolite as claimed in claim 1, it is characterized in that, described preparation method is:

(1) first sodium bicarbonate is dropped in water, be stirred to it to dissolve completely, be made into the basic solution that pH value is 10-12, drop into humic acids, rhamnolipid, cm-chitosan, alkyl glycoside subsequently, be stirred to mixture to dissolve completely, then cross-linking starch, silicon sol is dropped into again, and solution is heated to 60-80 DEG C, after stirring gelatinization 20-30min, nano zeolite is dropped in mixed solution, by gained slurry grinding distribution 40-50min after preliminary mixing, finally by gained material warm air drying, remove moisture completely, obtain the loaded cross-linked composites of starch of nano zeolite for subsequent use;

(2) the loaded cross-linked composites of starch of step (1) gained nano zeolite and silane coupling agent are uniformly mixed; add other leftover materials again; fully mix granulation in rear input singe screw tablets press, gained particle drops in inflation film manufacturing machine and blows film forming, to obtain final product.